Well I was looking around and saw very few/poor laning builds for Warwick! Being my main and prefering 3v3 games, I thought I'd share to all of you my awesome build that pretty much garantees a win in any 3v3 if your teamates are decent of course.

Their are other guides that explain how to play Warwick in details so I won't adventure into that.

Attack Speed and damage is key to Warwick, he can decimate any character 1v1 if played properly. The good thing about this build is even if you make some mistakes and are a little behind you can still catch up. The core build is simply

Berserkers Greaves Zeal and Madred's Bloodrazors

With these items you can and should be dominating your opponents, usually comes at level 8-12 depending if you where fed or not.
With about 70 different team arrangements against you in a 3v3 you need to adapt your end game build to the game! If they have some heavy caster team get magic resist! But I mean you probably know that already.

Hope the build inspires you.